<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:f="http://xmlns.jcp.org/jsf/core"
      xmlns:p="http://primefaces.org/ui">

<f:view contentType="text/html;charset=UTF-8" encoding="UTF-8">
    <h:head>

    </h:head>

    <h:body>

        <h:form id="form">
            <p:triStateCheckbox id="triStateCheckbox" value="#{triStateCheckbox001.value}" itemLabel="triStateCheckbox">
                <p:ajax process="@this"/>
            </p:triStateCheckbox>
            <br/>
            <p:triStateCheckbox id="readonly" value="#{triStateCheckbox001.readonly}" itemLabel="readonly" readonly="true"/>
            <br/>

            <p:commandButton id="button" update="@form" value="Submit"/>
        </h:form>

    </h:body>
</f:view>

</html>